Call of Duty Season 6 is starting on October 7, and Treyarch's blog post revealed the details for Black Ops Cold War's final Zombies map that arrives with the launch of the new season. The map is called Forsaken, and this round-based Zombies experience will conclude the Cold War storyline of the CIA Requiem research team's efforts to stop the Omega Group, who are responsible for all the Dark Aether portals and zombie outbreaks.
Requiem and Omega Group are now both fighting to extract Sergeant Kazimir Zykov from the Dark Aether. Both teams believe this Soviet soldier who closed the portal at Die Maschine's Projekt Endstation will be the key to dealing with the Forsaken, a powerful force that exists in the Dark Aether.
For players who haven't been collecting the in-game Zombies intel, YouTuber MrDalekJD has a great breakdown of some of the game's story intel, but Season 5's story suggests that Requiem and Omega Group have two different plans for dealing with the Forsaken. Requiem seem to be trying to stop the creature from crossing over, but Omega Group sounds like they are trying to capture and harness the powers of the Dark Aether creature for nefarious purposes.